2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 #include <urcu/list.h>
21 #include <urcu/uatomic.h>
23 #include <common/defaults.h>
24 #include <common/common.h>
25 #include <common/sessiond-comm/sessiond-comm.h>
26 #include <common/relayd/relayd.h>
33 #include "kernel-consumer.h"
34 #include "lttng-sessiond.h"
40 * Used to keep a unique index for each relayd socket created where this value
41 * is associated with streams on the consumer so it can match the right relayd
42 * to send to. It must be accessed with the relayd_net_seq_idx_lock
45 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
46 static uint64_t relayd_net_seq_idx
;
49 * Create a session path used by list_lttng_sessions for the case that the
50 * session consumer is on the network.
52 static int build_network_session_path(char *dst
, size_t size
,
53 struct ltt_session
*session
)
55 int ret
, kdata_port
, udata_port
;
56 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
57 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
62 memset(tmp_urls
, 0, sizeof(tmp_urls
));
63 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
65 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
67 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
68 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
69 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
72 if (session
->ust_session
&& session
->ust_session
->consumer
) {
73 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
74 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
77 if (uuri
== NULL
&& kuri
== NULL
) {
78 uri
= &session
->consumer
->dst
.net
.control
;
79 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
80 } else if (kuri
&& uuri
) {
81 ret
= uri_compare(kuri
, uuri
);
85 /* Build uuri URL string */
86 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
93 } else if (kuri
&& uuri
== NULL
) {
95 } else if (uuri
&& kuri
== NULL
) {
99 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
105 * Do we have a UST url set. If yes, this means we have both kernel and UST
108 if (*tmp_uurl
!= '\0') {
109 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
110 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
113 if (kuri
|| (!kuri
&& !uuri
)) {
116 /* No kernel URI, use the UST port. */
119 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
127 * Fill lttng_channel array of all channels.
129 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
130 struct lttng_channel
*channels
)
133 struct ltt_kernel_channel
*kchan
;
135 DBG("Listing channels for session %s", session
->name
);
138 case LTTNG_DOMAIN_KERNEL
:
139 /* Kernel channels */
140 if (session
->kernel_session
!= NULL
) {
141 cds_list_for_each_entry(kchan
,
142 &session
->kernel_session
->channel_list
.head
, list
) {
143 /* Copy lttng_channel struct to array */
144 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
145 channels
[i
].enabled
= kchan
->enabled
;
150 case LTTNG_DOMAIN_UST
:
152 struct lttng_ht_iter iter
;
153 struct ltt_ust_channel
*uchan
;
156 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
157 &iter
.iter
, uchan
, node
.node
) {
158 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
159 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
160 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
161 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
162 channels
[i
].attr
.switch_timer_interval
=
163 uchan
->attr
.switch_timer_interval
;
164 channels
[i
].attr
.read_timer_interval
=
165 uchan
->attr
.read_timer_interval
;
166 channels
[i
].enabled
= uchan
->enabled
;
167 switch (uchan
->attr
.output
) {
170 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
184 * Create a list of ust global domain events.
186 static int list_lttng_ust_global_events(char *channel_name
,
187 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
190 unsigned int nb_event
= 0;
191 struct lttng_ht_iter iter
;
192 struct lttng_ht_node_str
*node
;
193 struct ltt_ust_channel
*uchan
;
194 struct ltt_ust_event
*uevent
;
195 struct lttng_event
*tmp
;
197 DBG("Listing UST global events for channel %s", channel_name
);
201 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
202 node
= lttng_ht_iter_get_node_str(&iter
);
204 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
208 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
210 nb_event
+= lttng_ht_get_count(uchan
->events
);
217 DBG3("Listing UST global %d events", nb_event
);
219 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
221 ret
= LTTNG_ERR_FATAL
;
225 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
226 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
227 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
228 tmp
[i
].enabled
= uevent
->enabled
;
230 switch (uevent
->attr
.instrumentation
) {
231 case LTTNG_UST_TRACEPOINT
:
232 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
234 case LTTNG_UST_PROBE
:
235 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
237 case LTTNG_UST_FUNCTION
:
238 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
242 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
243 switch (uevent
->attr
.loglevel_type
) {
244 case LTTNG_UST_LOGLEVEL_ALL
:
245 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
247 case LTTNG_UST_LOGLEVEL_RANGE
:
248 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
250 case LTTNG_UST_LOGLEVEL_SINGLE
:
251 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
254 if (uevent
->filter
) {
269 * Fill lttng_event array of all kernel events in the channel.
271 static int list_lttng_kernel_events(char *channel_name
,
272 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
275 unsigned int nb_event
;
276 struct ltt_kernel_event
*event
;
277 struct ltt_kernel_channel
*kchan
;
279 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
281 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
285 nb_event
= kchan
->event_count
;
287 DBG("Listing events for channel %s", kchan
->channel
->name
);
293 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
294 if (*events
== NULL
) {
295 ret
= LTTNG_ERR_FATAL
;
299 /* Kernel channels */
300 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
301 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
302 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
303 (*events
)[i
].enabled
= event
->enabled
;
305 switch (event
->event
->instrumentation
) {
306 case LTTNG_KERNEL_TRACEPOINT
:
307 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
309 case LTTNG_KERNEL_KRETPROBE
:
310 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
311 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
312 sizeof(struct lttng_kernel_kprobe
));
314 case LTTNG_KERNEL_KPROBE
:
315 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
316 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
317 sizeof(struct lttng_kernel_kprobe
));
319 case LTTNG_KERNEL_FUNCTION
:
320 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
321 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
322 sizeof(struct lttng_kernel_function
));
324 case LTTNG_KERNEL_NOOP
:
325 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
327 case LTTNG_KERNEL_SYSCALL
:
328 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
330 case LTTNG_KERNEL_ALL
:
341 /* Negate the error code to differentiate the size from an error */
346 * Add URI so the consumer output object. Set the correct path depending on the
347 * domain adding the default trace directory.
349 static int add_uri_to_consumer(struct consumer_output
*consumer
,
350 struct lttng_uri
*uri
, int domain
, const char *session_name
)
353 const char *default_trace_dir
;
357 if (consumer
== NULL
) {
358 DBG("No consumer detected. Don't add URI. Stopping.");
359 ret
= LTTNG_ERR_NO_CONSUMER
;
364 case LTTNG_DOMAIN_KERNEL
:
365 default_trace_dir
= DEFAULT_KERNEL_TRACE_DIR
;
367 case LTTNG_DOMAIN_UST
:
368 default_trace_dir
= DEFAULT_UST_TRACE_DIR
;
372 * This case is possible is we try to add the URI to the global tracing
373 * session consumer object which in this case there is no subdir.
375 default_trace_dir
= "";
378 switch (uri
->dtype
) {
381 DBG2("Setting network URI to consumer");
383 if (consumer
->type
== CONSUMER_DST_NET
) {
384 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
385 consumer
->dst
.net
.control_isset
) ||
386 (uri
->stype
== LTTNG_STREAM_DATA
&&
387 consumer
->dst
.net
.data_isset
)) {
388 ret
= LTTNG_ERR_URL_EXIST
;
392 memset(&consumer
->dst
.net
, 0, sizeof(consumer
->dst
.net
));
395 consumer
->type
= CONSUMER_DST_NET
;
397 /* Set URI into consumer output object */
398 ret
= consumer_set_network_uri(consumer
, uri
);
402 } else if (ret
== 1) {
404 * URI was the same in the consumer so we do not append the subdir
405 * again so to not duplicate output dir.
410 if (uri
->stype
== LTTNG_STREAM_CONTROL
&& strlen(uri
->subdir
) == 0) {
411 ret
= consumer_set_subdir(consumer
, session_name
);
413 ret
= LTTNG_ERR_FATAL
;
418 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
419 /* On a new subdir, reappend the default trace dir. */
420 strncat(consumer
->subdir
, default_trace_dir
,
421 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
422 DBG3("Append domain trace name to subdir %s", consumer
->subdir
);
427 DBG2("Setting trace directory path from URI to %s", uri
->dst
.path
);
428 memset(consumer
->dst
.trace_path
, 0,
429 sizeof(consumer
->dst
.trace_path
));
430 strncpy(consumer
->dst
.trace_path
, uri
->dst
.path
,
431 sizeof(consumer
->dst
.trace_path
));
432 /* Append default trace dir */
433 strncat(consumer
->dst
.trace_path
, default_trace_dir
,
434 sizeof(consumer
->dst
.trace_path
) -
435 strlen(consumer
->dst
.trace_path
) - 1);
436 /* Flag consumer as local. */
437 consumer
->type
= CONSUMER_DST_LOCAL
;
448 * Init tracing by creating trace directory and sending fds kernel consumer.
450 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
453 struct lttng_ht_iter iter
;
454 struct consumer_socket
*socket
;
460 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
461 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
463 /* Code flow error */
464 assert(socket
->fd
>= 0);
466 pthread_mutex_lock(socket
->lock
);
467 ret
= kernel_consumer_send_session(socket
, session
);
468 pthread_mutex_unlock(socket
->lock
);
470 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
482 * Create a socket to the relayd using the URI.
484 * On success, the relayd_sock pointer is set to the created socket.
485 * Else, it's stays untouched and a lttcomm error code is returned.
487 static int create_connect_relayd(struct lttng_uri
*uri
,
488 struct lttcomm_relayd_sock
**relayd_sock
)
491 struct lttcomm_relayd_sock
*rsock
;
493 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
494 RELAYD_VERSION_COMM_MINOR
);
496 ret
= LTTNG_ERR_FATAL
;
501 * Connect to relayd so we can proceed with a session creation. This call
502 * can possibly block for an arbitrary amount of time to set the health
503 * state to be in poll execution.
506 ret
= relayd_connect(rsock
);
509 ERR("Unable to reach lttng-relayd");
510 ret
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
514 /* Create socket for control stream. */
515 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
516 DBG3("Creating relayd stream socket from URI");
518 /* Check relayd version */
519 ret
= relayd_version_check(rsock
);
521 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
524 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
525 DBG3("Creating relayd data socket from URI");
527 /* Command is not valid */
528 ERR("Relayd invalid stream type: %d", uri
->stype
);
529 ret
= LTTNG_ERR_INVALID
;
533 *relayd_sock
= rsock
;
538 /* The returned value is not useful since we are on an error path. */
539 (void) relayd_close(rsock
);
547 * Connect to the relayd using URI and send the socket to the right consumer.
549 static int send_consumer_relayd_socket(int domain
, struct ltt_session
*session
,
550 struct lttng_uri
*relayd_uri
, struct consumer_output
*consumer
,
551 struct consumer_socket
*consumer_sock
)
554 struct lttcomm_relayd_sock
*rsock
= NULL
;
556 /* Connect to relayd and make version check if uri is the control. */
557 ret
= create_connect_relayd(relayd_uri
, &rsock
);
558 if (ret
!= LTTNG_OK
) {
563 /* If the control socket is connected, network session is ready */
564 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
565 session
->net_handle
= 1;
568 /* Set the network sequence index if not set. */
569 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
570 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
572 * Increment net_seq_idx because we are about to transfer the
573 * new relayd socket to the consumer.
574 * Assign unique key so the consumer can match streams.
576 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
577 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
580 /* Send relayd socket to consumer. */
581 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
582 relayd_uri
->stype
, session
->id
);
584 ret
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
588 /* Flag that the corresponding socket was sent. */
589 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
590 consumer_sock
->control_sock_sent
= 1;
591 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
592 consumer_sock
->data_sock_sent
= 1;
598 * Close socket which was dup on the consumer side. The session daemon does
599 * NOT keep track of the relayd socket(s) once transfer to the consumer.
603 (void) relayd_close(rsock
);
607 if (ret
!= LTTNG_OK
) {
609 * The consumer output for this session should not be used anymore
610 * since the relayd connection failed thus making any tracing or/and
611 * streaming not usable.
613 consumer
->enabled
= 0;
619 * Send both relayd sockets to a specific consumer and domain. This is a
620 * helper function to facilitate sending the information to the consumer for a
623 static int send_consumer_relayd_sockets(int domain
,
624 struct ltt_session
*session
, struct consumer_output
*consumer
,
625 struct consumer_socket
*sock
)
632 /* Sending control relayd socket. */
633 if (!sock
->control_sock_sent
) {
634 ret
= send_consumer_relayd_socket(domain
, session
,
635 &consumer
->dst
.net
.control
, consumer
, sock
);
636 if (ret
!= LTTNG_OK
) {
641 /* Sending data relayd socket. */
642 if (!sock
->data_sock_sent
) {
643 ret
= send_consumer_relayd_socket(domain
, session
,
644 &consumer
->dst
.net
.data
, consumer
, sock
);
645 if (ret
!= LTTNG_OK
) {
655 * Setup relayd connections for a tracing session. First creates the socket to
656 * the relayd and send them to the right domain consumer. Consumer type MUST be
659 int cmd_setup_relayd(struct ltt_session
*session
)
662 struct ltt_ust_session
*usess
;
663 struct ltt_kernel_session
*ksess
;
664 struct consumer_socket
*socket
;
665 struct lttng_ht_iter iter
;
669 usess
= session
->ust_session
;
670 ksess
= session
->kernel_session
;
672 DBG("Setting relayd for session %s", session
->name
);
676 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
677 && usess
->consumer
->enabled
) {
678 /* For each consumer socket, send relayd sockets */
679 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
681 /* Code flow error */
682 assert(socket
->fd
>= 0);
684 pthread_mutex_lock(socket
->lock
);
685 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
,
686 usess
->consumer
, socket
);
687 pthread_mutex_unlock(socket
->lock
);
688 if (ret
!= LTTNG_OK
) {
694 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
695 && ksess
->consumer
->enabled
) {
696 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
698 /* Code flow error */
699 assert(socket
->fd
>= 0);
701 pthread_mutex_lock(socket
->lock
);
702 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
,
703 ksess
->consumer
, socket
);
704 pthread_mutex_unlock(socket
->lock
);
705 if (ret
!= LTTNG_OK
) {
717 * Start a kernel session by opening all necessary streams.
719 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
722 struct ltt_kernel_channel
*kchan
;
724 /* Open kernel metadata */
725 if (ksess
->metadata
== NULL
) {
726 ret
= kernel_open_metadata(ksess
);
728 ret
= LTTNG_ERR_KERN_META_FAIL
;
733 /* Open kernel metadata stream */
734 if (ksess
->metadata_stream_fd
< 0) {
735 ret
= kernel_open_metadata_stream(ksess
);
737 ERR("Kernel create metadata stream failed");
738 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
743 /* For each channel */
744 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
745 if (kchan
->stream_count
== 0) {
746 ret
= kernel_open_channel_stream(kchan
);
748 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
751 /* Update the stream global counter */
752 ksess
->stream_count_global
+= ret
;
756 /* Setup kernel consumer socket and send fds to it */
757 ret
= init_kernel_tracing(ksess
);
759 ret
= LTTNG_ERR_KERN_START_FAIL
;
763 /* This start the kernel tracing */
764 ret
= kernel_start_session(ksess
);
766 ret
= LTTNG_ERR_KERN_START_FAIL
;
770 /* Quiescent wait after starting trace */
771 kernel_wait_quiescent(kernel_tracer_fd
);
782 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
784 int cmd_disable_channel(struct ltt_session
*session
, int domain
,
788 struct ltt_ust_session
*usess
;
790 usess
= session
->ust_session
;
795 case LTTNG_DOMAIN_KERNEL
:
797 ret
= channel_kernel_disable(session
->kernel_session
,
799 if (ret
!= LTTNG_OK
) {
803 kernel_wait_quiescent(kernel_tracer_fd
);
806 case LTTNG_DOMAIN_UST
:
808 struct ltt_ust_channel
*uchan
;
809 struct lttng_ht
*chan_ht
;
811 chan_ht
= usess
->domain_global
.channels
;
813 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
815 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
819 ret
= channel_ust_disable(usess
, uchan
);
820 if (ret
!= LTTNG_OK
) {
826 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
827 case LTTNG_DOMAIN_UST_EXEC_NAME
:
828 case LTTNG_DOMAIN_UST_PID
:
831 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
843 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
845 * The wpipe arguments is used as a notifier for the kernel thread.
847 int cmd_enable_channel(struct ltt_session
*session
,
848 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
851 struct ltt_ust_session
*usess
= session
->ust_session
;
852 struct lttng_ht
*chan_ht
;
858 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
861 * Don't try to enable a channel if the session has been started at
862 * some point in time before. The tracer does not allow it.
864 if (session
->started
) {
865 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
871 switch (domain
->type
) {
872 case LTTNG_DOMAIN_KERNEL
:
874 struct ltt_kernel_channel
*kchan
;
876 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
877 session
->kernel_session
);
879 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
881 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
884 if (ret
!= LTTNG_OK
) {
888 kernel_wait_quiescent(kernel_tracer_fd
);
891 case LTTNG_DOMAIN_UST
:
893 struct ltt_ust_channel
*uchan
;
895 chan_ht
= usess
->domain_global
.channels
;
897 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
899 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
901 ret
= channel_ust_enable(usess
, uchan
);
906 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
917 * Command LTTNG_DISABLE_EVENT processed by the client thread.
919 int cmd_disable_event(struct ltt_session
*session
, int domain
,
920 char *channel_name
, char *event_name
)
927 case LTTNG_DOMAIN_KERNEL
:
929 struct ltt_kernel_channel
*kchan
;
930 struct ltt_kernel_session
*ksess
;
932 ksess
= session
->kernel_session
;
934 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
936 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
940 ret
= event_kernel_disable_tracepoint(kchan
, event_name
);
941 if (ret
!= LTTNG_OK
) {
945 kernel_wait_quiescent(kernel_tracer_fd
);
948 case LTTNG_DOMAIN_UST
:
950 struct ltt_ust_channel
*uchan
;
951 struct ltt_ust_session
*usess
;
953 usess
= session
->ust_session
;
955 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
958 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
962 ret
= event_ust_disable_tracepoint(usess
, uchan
, event_name
);
963 if (ret
!= LTTNG_OK
) {
967 DBG3("Disable UST event %s in channel %s completed", event_name
,
972 case LTTNG_DOMAIN_UST_EXEC_NAME
:
973 case LTTNG_DOMAIN_UST_PID
:
974 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
989 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
991 int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
999 case LTTNG_DOMAIN_KERNEL
:
1001 struct ltt_kernel_session
*ksess
;
1002 struct ltt_kernel_channel
*kchan
;
1004 ksess
= session
->kernel_session
;
1006 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1007 if (kchan
== NULL
) {
1008 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1012 ret
= event_kernel_disable_all(kchan
);
1013 if (ret
!= LTTNG_OK
) {
1017 kernel_wait_quiescent(kernel_tracer_fd
);
1020 case LTTNG_DOMAIN_UST
:
1022 struct ltt_ust_session
*usess
;
1023 struct ltt_ust_channel
*uchan
;
1025 usess
= session
->ust_session
;
1027 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1029 if (uchan
== NULL
) {
1030 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1034 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1039 DBG3("Disable all UST events in channel %s completed", channel_name
);
1044 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1045 case LTTNG_DOMAIN_UST_PID
:
1046 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1049 ret
= LTTNG_ERR_UND
;
1061 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1063 int cmd_add_context(struct ltt_session
*session
, int domain
,
1064 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1066 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1069 case LTTNG_DOMAIN_KERNEL
:
1070 assert(session
->kernel_session
);
1072 if (session
->kernel_session
->channel_count
== 0) {
1073 /* Create default channel */
1074 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1075 if (ret
!= LTTNG_OK
) {
1078 chan_kern_created
= 1;
1081 /* Add kernel context to kernel tracer */
1082 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1083 if (ret
!= LTTNG_OK
) {
1087 case LTTNG_DOMAIN_UST
:
1089 struct ltt_ust_session
*usess
= session
->ust_session
;
1092 unsigned int chan_count
=
1093 lttng_ht_get_count(usess
->domain_global
.channels
);
1094 if (chan_count
== 0) {
1095 struct lttng_channel
*attr
;
1096 /* Create default channel */
1097 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1099 ret
= LTTNG_ERR_FATAL
;
1103 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1104 if (ret
!= LTTNG_OK
) {
1109 chan_ust_created
= 1;
1112 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1113 if (ret
!= LTTNG_OK
) {
1119 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1120 case LTTNG_DOMAIN_UST_PID
:
1121 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1124 ret
= LTTNG_ERR_UND
;
1131 if (chan_kern_created
) {
1132 struct ltt_kernel_channel
*kchan
=
1133 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1134 session
->kernel_session
);
1135 /* Created previously, this should NOT fail. */
1137 kernel_destroy_channel(kchan
);
1140 if (chan_ust_created
) {
1141 struct ltt_ust_channel
*uchan
=
1142 trace_ust_find_channel_by_name(
1143 session
->ust_session
->domain_global
.channels
,
1144 DEFAULT_CHANNEL_NAME
);
1145 /* Created previously, this should NOT fail. */
1147 /* Remove from the channel list of the session. */
1148 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1150 trace_ust_destroy_channel(uchan
);
1156 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1158 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
1159 char *channel_name
, struct lttng_event
*event
,
1160 struct lttng_filter_bytecode
*filter
, int wpipe
)
1162 int ret
, channel_created
= 0;
1163 struct lttng_channel
*attr
;
1167 assert(channel_name
);
1171 switch (domain
->type
) {
1172 case LTTNG_DOMAIN_KERNEL
:
1174 struct ltt_kernel_channel
*kchan
;
1176 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1177 session
->kernel_session
);
1178 if (kchan
== NULL
) {
1179 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1180 LTTNG_BUFFER_GLOBAL
);
1182 ret
= LTTNG_ERR_FATAL
;
1185 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1187 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1188 if (ret
!= LTTNG_OK
) {
1194 channel_created
= 1;
1197 /* Get the newly created kernel channel pointer */
1198 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1199 session
->kernel_session
);
1200 if (kchan
== NULL
) {
1201 /* This sould not happen... */
1202 ret
= LTTNG_ERR_FATAL
;
1206 ret
= event_kernel_enable_tracepoint(kchan
, event
);
1207 if (ret
!= LTTNG_OK
) {
1208 if (channel_created
) {
1209 /* Let's not leak a useless channel. */
1210 kernel_destroy_channel(kchan
);
1215 kernel_wait_quiescent(kernel_tracer_fd
);
1218 case LTTNG_DOMAIN_UST
:
1220 struct ltt_ust_channel
*uchan
;
1221 struct ltt_ust_session
*usess
= session
->ust_session
;
1225 /* Get channel from global UST domain */
1226 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1228 if (uchan
== NULL
) {
1229 /* Create default channel */
1230 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1231 usess
->buffer_type
);
1233 ret
= LTTNG_ERR_FATAL
;
1236 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1238 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1239 if (ret
!= LTTNG_OK
) {
1245 /* Get the newly created channel reference back */
1246 uchan
= trace_ust_find_channel_by_name(
1247 usess
->domain_global
.channels
, channel_name
);
1251 /* At this point, the session and channel exist on the tracer */
1252 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
, filter
);
1253 if (ret
!= LTTNG_OK
) {
1259 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1260 case LTTNG_DOMAIN_UST_PID
:
1261 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1264 ret
= LTTNG_ERR_UND
;
1276 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1278 int cmd_enable_event_all(struct ltt_session
*session
,
1279 struct lttng_domain
*domain
, char *channel_name
, int event_type
,
1280 struct lttng_filter_bytecode
*filter
, int wpipe
)
1283 struct lttng_channel
*attr
;
1286 assert(channel_name
);
1290 switch (domain
->type
) {
1291 case LTTNG_DOMAIN_KERNEL
:
1293 struct ltt_kernel_channel
*kchan
;
1295 assert(session
->kernel_session
);
1297 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1298 session
->kernel_session
);
1299 if (kchan
== NULL
) {
1300 /* Create default channel */
1301 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
1302 LTTNG_BUFFER_GLOBAL
);
1304 ret
= LTTNG_ERR_FATAL
;
1307 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1309 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1310 if (ret
!= LTTNG_OK
) {
1316 /* Get the newly created kernel channel pointer */
1317 kchan
= trace_kernel_get_channel_by_name(channel_name
,
1318 session
->kernel_session
);
1322 switch (event_type
) {
1323 case LTTNG_EVENT_SYSCALL
:
1324 ret
= event_kernel_enable_all_syscalls(kchan
, kernel_tracer_fd
);
1326 case LTTNG_EVENT_TRACEPOINT
:
1328 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1329 * events already registered to the channel.
1331 ret
= event_kernel_enable_all_tracepoints(kchan
, kernel_tracer_fd
);
1333 case LTTNG_EVENT_ALL
:
1334 /* Enable syscalls and tracepoints */
1335 ret
= event_kernel_enable_all(kchan
, kernel_tracer_fd
);
1338 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1342 /* Manage return value */
1343 if (ret
!= LTTNG_OK
) {
1345 * On error, cmd_enable_channel call will take care of destroying
1346 * the created channel if it was needed.
1351 kernel_wait_quiescent(kernel_tracer_fd
);
1354 case LTTNG_DOMAIN_UST
:
1356 struct ltt_ust_channel
*uchan
;
1357 struct ltt_ust_session
*usess
= session
->ust_session
;
1361 /* Get channel from global UST domain */
1362 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1364 if (uchan
== NULL
) {
1365 /* Create default channel */
1366 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
1367 usess
->buffer_type
);
1369 ret
= LTTNG_ERR_FATAL
;
1372 strncpy(attr
->name
, channel_name
, sizeof(attr
->name
));
1374 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
1375 if (ret
!= LTTNG_OK
) {
1381 /* Get the newly created channel reference back */
1382 uchan
= trace_ust_find_channel_by_name(
1383 usess
->domain_global
.channels
, channel_name
);
1387 /* At this point, the session and channel exist on the tracer */
1389 switch (event_type
) {
1390 case LTTNG_EVENT_ALL
:
1391 case LTTNG_EVENT_TRACEPOINT
:
1392 ret
= event_ust_enable_all_tracepoints(usess
, uchan
, filter
);
1393 if (ret
!= LTTNG_OK
) {
1398 ret
= LTTNG_ERR_UST_ENABLE_FAIL
;
1402 /* Manage return value */
1403 if (ret
!= LTTNG_OK
) {
1410 case LTTNG_DOMAIN_UST_EXEC_NAME
:
1411 case LTTNG_DOMAIN_UST_PID
:
1412 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
1415 ret
= LTTNG_ERR_UND
;
1428 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1430 ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
1433 ssize_t nb_events
= 0;
1436 case LTTNG_DOMAIN_KERNEL
:
1437 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
1438 if (nb_events
< 0) {
1439 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
1443 case LTTNG_DOMAIN_UST
:
1444 nb_events
= ust_app_list_events(events
);
1445 if (nb_events
< 0) {
1446 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1451 ret
= LTTNG_ERR_UND
;
1458 /* Return negative value to differentiate return code */
1463 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1465 ssize_t
cmd_list_tracepoint_fields(int domain
,
1466 struct lttng_event_field
**fields
)
1469 ssize_t nb_fields
= 0;
1472 case LTTNG_DOMAIN_UST
:
1473 nb_fields
= ust_app_list_event_fields(fields
);
1474 if (nb_fields
< 0) {
1475 ret
= LTTNG_ERR_UST_LIST_FAIL
;
1479 case LTTNG_DOMAIN_KERNEL
:
1480 default: /* fall-through */
1481 ret
= LTTNG_ERR_UND
;
1488 /* Return negative value to differentiate return code */
1493 * Command LTTNG_START_TRACE processed by the client thread.
1495 int cmd_start_trace(struct ltt_session
*session
)
1498 struct ltt_kernel_session
*ksession
;
1499 struct ltt_ust_session
*usess
;
1503 /* Ease our life a bit ;) */
1504 ksession
= session
->kernel_session
;
1505 usess
= session
->ust_session
;
1507 if (session
->enabled
) {
1508 /* Already started. */
1509 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1513 session
->enabled
= 1;
1515 /* Kernel tracing */
1516 if (ksession
!= NULL
) {
1517 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
1518 if (ret
!= LTTNG_OK
) {
1523 /* Flag session that trace should start automatically */
1525 usess
->start_trace
= 1;
1527 ret
= ust_app_start_trace_all(usess
);
1529 ret
= LTTNG_ERR_UST_START_FAIL
;
1534 session
->started
= 1;
1543 * Command LTTNG_STOP_TRACE processed by the client thread.
1545 int cmd_stop_trace(struct ltt_session
*session
)
1548 struct ltt_kernel_channel
*kchan
;
1549 struct ltt_kernel_session
*ksession
;
1550 struct ltt_ust_session
*usess
;
1555 ksession
= session
->kernel_session
;
1556 usess
= session
->ust_session
;
1558 if (!session
->enabled
) {
1559 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
1563 session
->enabled
= 0;
1566 if (ksession
&& ksession
->started
) {
1567 DBG("Stop kernel tracing");
1569 /* Flush metadata if exist */
1570 if (ksession
->metadata_stream_fd
>= 0) {
1571 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
1573 ERR("Kernel metadata flush failed");
1577 /* Flush all buffers before stopping */
1578 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
1579 ret
= kernel_flush_buffer(kchan
);
1581 ERR("Kernel flush buffer error");
1585 ret
= kernel_stop_session(ksession
);
1587 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1591 kernel_wait_quiescent(kernel_tracer_fd
);
1593 ksession
->started
= 0;
1596 if (usess
&& usess
->start_trace
) {
1597 usess
->start_trace
= 0;
1599 ret
= ust_app_stop_trace_all(usess
);
1601 ret
= LTTNG_ERR_UST_STOP_FAIL
;
1613 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1615 int cmd_set_consumer_uri(int domain
, struct ltt_session
*session
,
1616 size_t nb_uri
, struct lttng_uri
*uris
)
1619 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1620 struct ltt_ust_session
*usess
= session
->ust_session
;
1621 struct consumer_output
*consumer
= NULL
;
1627 /* Can't enable consumer after session started. */
1628 if (session
->enabled
) {
1629 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1634 * This case switch makes sure the domain session has a temporary consumer
1635 * so the URL can be set.
1639 /* Code flow error. A session MUST always have a consumer object */
1640 assert(session
->consumer
);
1642 * The URL will be added to the tracing session consumer instead of a
1643 * specific domain consumer.
1645 consumer
= session
->consumer
;
1647 case LTTNG_DOMAIN_KERNEL
:
1648 /* Code flow error if we don't have a kernel session here. */
1650 assert(ksess
->consumer
);
1651 consumer
= ksess
->consumer
;
1653 case LTTNG_DOMAIN_UST
:
1654 /* Code flow error if we don't have a kernel session here. */
1656 assert(usess
->consumer
);
1657 consumer
= usess
->consumer
;
1661 for (i
= 0; i
< nb_uri
; i
++) {
1662 ret
= add_uri_to_consumer(consumer
, &uris
[i
], domain
, session
->name
);
1663 if (ret
!= LTTNG_OK
) {
1676 * Command LTTNG_CREATE_SESSION processed by the client thread.
1678 int cmd_create_session_uri(char *name
, struct lttng_uri
*uris
,
1679 size_t nb_uri
, lttng_sock_cred
*creds
)
1682 struct ltt_session
*session
;
1686 /* No URIs is not possible. */
1688 ret
= LTTNG_ERR_SESSION_FAIL
;
1693 * Verify if the session already exist
1695 * XXX: There is no need for the session lock list here since the caller
1696 * (process_client_msg) is holding it. We might want to change that so a
1697 * single command does not lock the entire session list.
1699 session
= session_find_by_name(name
);
1700 if (session
!= NULL
) {
1701 ret
= LTTNG_ERR_EXIST_SESS
;
1705 /* Create tracing session in the registry */
1706 ret
= session_create(name
, LTTNG_SOCK_GET_UID_CRED(creds
),
1707 LTTNG_SOCK_GET_GID_CRED(creds
));
1708 if (ret
!= LTTNG_OK
) {
1713 * Get the newly created session pointer back
1715 * XXX: There is no need for the session lock list here since the caller
1716 * (process_client_msg) is holding it. We might want to change that so a
1717 * single command does not lock the entire session list.
1719 session
= session_find_by_name(name
);
1722 /* Create default consumer output for the session not yet created. */
1723 session
->consumer
= consumer_create_output(CONSUMER_DST_LOCAL
);
1724 if (session
->consumer
== NULL
) {
1725 ret
= LTTNG_ERR_FATAL
;
1726 goto consumer_error
;
1729 ret
= cmd_set_consumer_uri(0, session
, nb_uri
, uris
);
1730 if (ret
!= LTTNG_OK
) {
1731 goto consumer_error
;
1734 session
->consumer
->enabled
= 1;
1739 session_destroy(session
);
1746 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1748 int cmd_destroy_session(struct ltt_session
*session
, int wpipe
)
1751 struct ltt_ust_session
*usess
;
1752 struct ltt_kernel_session
*ksess
;
1757 usess
= session
->ust_session
;
1758 ksess
= session
->kernel_session
;
1760 /* Clean kernel session teardown */
1761 kernel_destroy_session(ksess
);
1763 /* UST session teardown */
1765 /* Close any relayd session */
1766 consumer_output_send_destroy_relayd(usess
->consumer
);
1768 /* Destroy every UST application related to this session. */
1769 ret
= ust_app_destroy_trace_all(usess
);
1771 ERR("Error in ust_app_destroy_trace_all");
1774 /* Clean up the rest. */
1775 trace_ust_destroy_session(usess
);
1779 * Must notify the kernel thread here to update it's poll set in order to
1780 * remove the channel(s)' fd just destroyed.
1782 ret
= notify_thread_pipe(wpipe
);
1784 PERROR("write kernel poll pipe");
1787 ret
= session_destroy(session
);
1793 * Command LTTNG_CALIBRATE processed by the client thread.
1795 int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
1800 case LTTNG_DOMAIN_KERNEL
:
1802 struct lttng_kernel_calibrate kcalibrate
;
1804 kcalibrate
.type
= calibrate
->type
;
1805 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
1807 ret
= LTTNG_ERR_KERN_ENABLE_FAIL
;
1812 case LTTNG_DOMAIN_UST
:
1814 struct lttng_ust_calibrate ucalibrate
;
1816 ucalibrate
.type
= calibrate
->type
;
1817 ret
= ust_app_calibrate_glb(&ucalibrate
);
1819 ret
= LTTNG_ERR_UST_CALIBRATE_FAIL
;
1825 ret
= LTTNG_ERR_UND
;
1836 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1838 int cmd_register_consumer(struct ltt_session
*session
, int domain
,
1839 const char *sock_path
, struct consumer_data
*cdata
)
1842 struct consumer_socket
*socket
= NULL
;
1849 case LTTNG_DOMAIN_KERNEL
:
1851 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
1855 /* Can't register a consumer if there is already one */
1856 if (ksess
->consumer_fds_sent
!= 0) {
1857 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
1861 sock
= lttcomm_connect_unix_sock(sock_path
);
1863 ret
= LTTNG_ERR_CONNECT_FAIL
;
1867 socket
= consumer_allocate_socket(sock
);
1868 if (socket
== NULL
) {
1871 PERROR("close register consumer");
1873 ret
= LTTNG_ERR_FATAL
;
1877 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
1878 if (socket
->lock
== NULL
) {
1879 PERROR("zmalloc pthread mutex");
1880 ret
= LTTNG_ERR_FATAL
;
1883 pthread_mutex_init(socket
->lock
, NULL
);
1884 socket
->registered
= 1;
1887 consumer_add_socket(socket
, ksess
->consumer
);
1890 pthread_mutex_lock(&cdata
->pid_mutex
);
1892 pthread_mutex_unlock(&cdata
->pid_mutex
);
1897 /* TODO: Userspace tracing */
1898 ret
= LTTNG_ERR_UND
;
1906 consumer_destroy_socket(socket
);
1912 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1914 ssize_t
cmd_list_domains(struct ltt_session
*session
,
1915 struct lttng_domain
**domains
)
1920 if (session
->kernel_session
!= NULL
) {
1921 DBG3("Listing domains found kernel domain");
1925 if (session
->ust_session
!= NULL
) {
1926 DBG3("Listing domains found UST global domain");
1930 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
1931 if (*domains
== NULL
) {
1932 ret
= LTTNG_ERR_FATAL
;
1936 if (session
->kernel_session
!= NULL
) {
1937 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
1941 if (session
->ust_session
!= NULL
) {
1942 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
1943 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
1950 /* Return negative value to differentiate return code */
1956 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1958 ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
1959 struct lttng_channel
**channels
)
1962 ssize_t nb_chan
= 0;
1965 case LTTNG_DOMAIN_KERNEL
:
1966 if (session
->kernel_session
!= NULL
) {
1967 nb_chan
= session
->kernel_session
->channel_count
;
1969 DBG3("Number of kernel channels %zd", nb_chan
);
1971 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1974 case LTTNG_DOMAIN_UST
:
1975 if (session
->ust_session
!= NULL
) {
1976 nb_chan
= lttng_ht_get_count(
1977 session
->ust_session
->domain_global
.channels
);
1979 DBG3("Number of UST global channels %zd", nb_chan
);
1981 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1986 ret
= LTTNG_ERR_UND
;
1991 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
1992 if (*channels
== NULL
) {
1993 ret
= LTTNG_ERR_FATAL
;
1997 list_lttng_channels(domain
, session
, *channels
);
2000 /* Ret value was set in the domain switch case */
2007 /* Return negative value to differentiate return code */
2012 * Command LTTNG_LIST_EVENTS processed by the client thread.
2014 ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2015 char *channel_name
, struct lttng_event
**events
)
2018 ssize_t nb_event
= 0;
2021 case LTTNG_DOMAIN_KERNEL
:
2022 if (session
->kernel_session
!= NULL
) {
2023 nb_event
= list_lttng_kernel_events(channel_name
,
2024 session
->kernel_session
, events
);
2027 case LTTNG_DOMAIN_UST
:
2029 if (session
->ust_session
!= NULL
) {
2030 nb_event
= list_lttng_ust_global_events(channel_name
,
2031 &session
->ust_session
->domain_global
, events
);
2036 ret
= LTTNG_ERR_UND
;
2043 /* Return negative value to differentiate return code */
2048 * Using the session list, filled a lttng_session array to send back to the
2049 * client for session listing.
2051 * The session list lock MUST be acquired before calling this function. Use
2052 * session_lock_list() and session_unlock_list().
2054 void cmd_list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2059 struct ltt_session
*session
;
2060 struct ltt_session_list
*list
= session_get_list();
2062 DBG("Getting all available session for UID %d GID %d",
2065 * Iterate over session list and append data after the control struct in
2068 cds_list_for_each_entry(session
, &list
->head
, list
) {
2070 * Only list the sessions the user can control.
2072 if (!session_access_ok(session
, uid
, gid
)) {
2076 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2077 struct ltt_ust_session
*usess
= session
->ust_session
;
2079 if (session
->consumer
->type
== CONSUMER_DST_NET
||
2080 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
2081 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
2082 ret
= build_network_session_path(sessions
[i
].path
,
2083 sizeof(sessions
[i
].path
), session
);
2085 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
2086 session
->consumer
->dst
.trace_path
);
2089 PERROR("snprintf session path");
2093 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2094 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2095 sessions
[i
].enabled
= session
->enabled
;
2101 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2102 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2104 int cmd_data_pending(struct ltt_session
*session
)
2107 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2108 struct ltt_ust_session
*usess
= session
->ust_session
;
2112 /* Session MUST be stopped to ask for data availability. */
2113 if (session
->enabled
) {
2114 ret
= LTTNG_ERR_SESSION_STARTED
;
2118 if (ksess
&& ksess
->consumer
) {
2119 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
2121 /* Data is still being extracted for the kernel. */
2126 if (usess
&& usess
->consumer
) {
2127 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
2129 /* Data is still being extracted for the kernel. */
2134 /* Data is ready to be read by a viewer */
2142 * Init command subsystem.
2147 * Set network sequence index to 1 for streams to match a relayd
2148 * socket on the consumer side.
2150 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
2151 relayd_net_seq_idx
= 1;
2152 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
2154 DBG("Command subsystem initialized");